Non-return valve.



G. I. STUART.

NON-RETURN VALVE`- APPLICATION FILED APII.25. I9I6.

1,278,250. Patented Sept. 1Q, 1918.

' J WITNESS :Rs cat. Nom-Lima, wAsunvnroN. n. c.

GEORGE J". STUART, 0E PITTSBURGH, PENNSYLVANIA, ASSIGNOR T0 THE PITTSBURGH VALVE, FOUNDRY AND ACONSTRUCTION COMPANY, OF PITTSBURGH, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA.

N ON-RETURN VALVE.

Specification of Letters Patent.

Patented sept. 1o, 1918.

To all whom t may concern:

Be it known that I, GEORGE J. STUART, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Non-Return Valves, of which the following is a specification.

My invention relates to non-return valves.

The object of this invention is to provide means whereby the valve proper will rest properly on its seat whether or not the valve actuating stem is arranged exactly in axial alinement with the valve and its seat. Other objects will appear hereinafter.

The accompanying drawing illustrates, partly in vertical section and partly in side elevation, a valve containing the preferred form of my invention.

On the drawing, 1 indicates a valve-casing having the inlet 2, the outlet 3, the valve-seat 4, the central cavity 5, and the opening 6 directly above the valve-seat and the central cavity, the valve-seat and the opening 6 being preferably circular and in axial alinement.

The upper end of the casing is provided with the external flange 7 extending preferably at right angles to the axis of the valveseat and opening 6. The upper face of the Casing has an annular seat or recess 8 opening into the opening 6, to receive the outwardly-extending iiange 9 on the periphery of the head or cylinder 10 of the valveguiding device. The cylinder 10 is open toward the valve-seat 4, but has the top wall or closure 11 provided with the central opening 12 which is in axial alinement with the opening 6. A tubular guide 13 extends downwardly from the wall 11 to the vicinity of the valve-seat 4 and has its inner and outer surfaces concentric with the axis of the opening 6, the inner surface of the guide being a downward continuation of the wall of the opening 12. The seat 8 and the flange 9, as well as the guide 13, are preferably constructed and arranged so that the guide shall be firmly held exactly concentric with the aforementioned axis of the opening 6 and the valve-seat 4.

14 is a tubular valve-stem litting the periphery of the guide 13 accurately and reciprocable thereon.v The lower end of the stem 14 carries the valve l5 which is adapted to l'itthe seat 4 with accuracy. Preferably the valve 15 is hollow and has openings'l, connecting the interior of the valve 15 to the cavity 5. rlhe upper end of the stem 14 carries 'the piston 17 which coperates with the interior surface of the cylinder 10 and has the annular packing'18 to prevent or, atleast, to materially reduce the flow of steaml past the piston into the cylinder.

' 19 represents the cap for the casing 1, between which and the casing 1 the gasket 2O is clamped by the bolts 21 passed through the iiange 7 and an opposing flange 22 on Vthe cap 19.

23 is a valve-operating stem, which extends down through the cap 19 and loosely through the guide 13 into loose engagement with the valve 15 at the bottom of the hollow 24 therein. The stem 23 has the threads 25 which work on the nut 26 supported by the upward extensionv 27 on the cap 19. The stem 23 may be rotated by means applied thereto above the nut 26, the stem being broken oif there.

The stem 23 is provided with the backing 28 in the cap, 29 being the gland therefor controlled by the bolts 30.

It is seen that, even if the gasket 20 should be compressed more at one place than another, so as to cause the stem to be slightly out of axial alinement with the valve and valve-seat, nevertheless the valve would be able to seat perfectly, as the alinement of the valve-stem 14 is not determined or controlled by the stem 23. If sediment gathers in the cavity 24, the movement of the cavity up around the end of the stem 14, and the reciprocationof the stem 23 in the cavity, would cause a large portion of the sediment to be ejected through the openings 16 into the cavity 5, and prevent the sticking of the stem 23 in the valve or the interference of the sediment with the operation of the valve 15.

Many return valves chatter incessantly and loudly while in use. I iind that my Vvalve does not chatter owing to the nice adjustment and fit of the parts as described.

I claim- 1. In a non-return valve, a casing having at one side a valve-seat and at the opposite side an opening in axial alinement with 'the valve-seat, a tubular cylinder secured in the tubular member and ada tedto engage the valve to force the latter on the valve-seat.

2. In a non-return valve, a casing having at'one side a valve-seat and at the opposite side an opening, a reciprocable tubular lvalve-stem in aXial alinement with the opening and valve-seat, a valve for the valveseat on one end of the valve-Stem and a piston onv the other end, a tubular guide fitting the interior of the valve-stem, a tubular Cylinder' in which the piston may reciprocate and to the outer end of whichzthe tubular. guide is Connected, a coperating flange and recess, one borne by the cylinder and the other by the easing, for supporting the tubular guide in aXial alnement with the valve-seat, a cap, a valve-closing stem carried bythe cap andeXtending through the tubulargu-ide to the valve, a gasket between the casing and the cap, and means for clamping the gasket between the casing and the Cap. l

3. In a valve, a easing having at one side a valve-seat and -at the other side a hollow vcylinder with the inner end open and its outer end closed,- a .tubular 4member extending from the outer end lof the cylinder toward the said valve-seat, and a tubular member slidable on the vrst tubular member and having at one end -a valve for the valve- Seat and at the other end a piston for the Cylinder, and a valve-closing stem reciprocable within the first tubular member.

Signed at Pittsburgh, Pa., this 21st day of Aprh A. D. 1916. y

GEQRGEJ. STUART.

v Copies or this Ypatentmafy be obtained for ve cents each, Aby addresging-the zcommissioner 9! Eaten,

Wlhirngton, D. C. 

